Glass

was known to the Egyptians at a very early period of their
national history, at least B.C. 1500. Various articles both
useful and ornamental were made of it, as bottles, vases, etc. A
glass bottle with the name of Sargon on it was found among the
ruins of the north-west palace of Nimroud. The Hebrew word
"zekukith" (Job 28:17), rendered in the Authorized Version
"crystal," is rightly rendered in the Revised Version "glass."
This is the only allusion to glass found in the Old Testament.
It is referred to in the New Testament in Rev. 4:6; 15:2; 21:18,
21. In Job 37:18, the word rendered "looking-glass" is in the
Revised Version properly rendered "mirror," formed, i.e., of
some metal. (Compare Ex. 38:8: "looking-glasses" are brazen
mirrors, R.V.). A mirror is referred to also in James 1:23.